Add biome-ignore for JSDoc-only type imports

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Summary

• Added biome-ignore comment for ErrorResponse import used solely in JSDoc @link references

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Why

• Addresses feedback on feat(ensnode-sdk): introduce EnsIndexerClient #1643 where linter flagged ErrorResponse as unused
• Type is imported exclusively for documentation linking via {@link ErrorResponse}, not runtime usage

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Testing

• Code review: no issues
• CodeQL: no vulnerabilities

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Notes for Reviewer (Optional)

Pattern:

// biome-ignore lint/correctness/noUnusedImports: ErrorResponse is used in JSDoc @link
import type { ErrorResponse } from "./response";

/**
 * Schema for {@link ErrorResponse}.
 */
export const ErrorResponseSchema = z.object({...});

This mirrors how types-for-docs are handled elsewhere when linters don't recognize JSDoc references as usage.

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Pre-Review Checklist (Blocking)

• This PR does not introduce significant changes and is low-risk to review quickly.
• Relevant changesets are included (or are not required)

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Project	Deployment	Actions	Updated (UTC)
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Additional Suggestion:

The ErrorResponse type is imported but only used in a JSDoc {@link} comment, triggering biome's noUnusedImports rule without a suppression comment